This book arises from a personal reflection. It is a suggested reconstruction of Christian theism arising out of phenomenological philosophy, which appears to be gaining acceptance in Catholic theological circles since Vatican II. Henri Bergson (1859-1941) has influenced my thinking in this regard. He observes that philosophy is the study of becoming in general and, as a continuation of science, is not a new scholasticism that has grown up during the latter half of the nineteenth century around the physics of Galileo, as the old scholasticism grew up around Aristotle. Although this monograph arises within a particular Catholic theological perspective the ideas and notions discussed, I believe, have significance for an ecumenical Christian theology. This book is based on a phenomenological philosophical reflection, as opposed to a presentation of an uncritical exposé of ideas. That is to say, the ideas I present here have been reflected upon, considered and re-considered.